The methodology for calculating transport sea freight debits by country has changed. Formerly country allocation of sea freight debits were calculated based on sea freight direct commissions data as collected from the ABS Survey of International Trade in Services. Country allocation is now determined using country of beneficial owner data as sourced from Bloomberg and the World Shipping Register. This is a more accurate reflection of international trade in sea freight, and has caused revisions from 2007 (source data prior to 2007 was unavailable or not fit for purpose). Because of this change in methodology, a trend break occurs for several countries from 2006 to 2007.